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Thread: Subtract one sprite from another?

  1. Jun 30th, 2001, 06:38 AM #1
    BitBlt
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    Subtract one sprite from another?

    what i'm trying to do is do something like "Worms" where the explosions take out half the land.

    is it possible to do this using sprites, or what would you suggest?

    thnx!
    When I write my code, only God and I know what it means. But a week later, only God knows.
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  2. Jun 30th, 2001, 08:37 AM #2
    Jotaf98
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    Sure, just blt a circle to the terrain the same color as the background!
    Code:
    Temp = Me.GetIQ()
'Error 9: Overflow
'DON'T PANIC! :eek:

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  3. Jun 30th, 2001, 05:47 PM #3
    kedaman
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    There's a gdi call Ellipse for drawing circles on dc's. If you have an animated or floating background or even mask blit the foreground over the background then you could ellipse on the foreground with the maskcolor and then blit it on the background.
    Use
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    reverse (p (6*9)) where p x|x==0=""|True=chr (48+z): p y where (y,z)=divMod x 13
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  4. Jul 1st, 2001, 07:07 PM #4
    Jotaf98
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    Yeah, but I'm assuming he has it like this: a background image that is blted first, and then the terrain image, where the destroied parts are transparent so you can see the background.
    Code:
    Temp = Me.GetIQ()
'Error 9: Overflow
'DON'T PANIC! :eek:

    To learn how to use realistic effects in your games like fire, rain, snow and magic effects, read my article on particles systems here.


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    "Cats land on their feet. Toast lands peanut butter side down. A cat with toast strapped to its back will hover above the ground in a state of quantum indecision."
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  6. Jul 2nd, 2001, 03:22 AM #5
    kedaman
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    as was I
    Use
    writing software in C++ is like driving rivets into steel beam with a toothpick.
    writing haskell makes your life easier:
    reverse (p (6*9)) where p x|x==0=""|True=chr (48+z): p y where (y,z)=divMod x 13
    To throw away OOP for low level languages is myopia, to keep OOP is hyperopia. To throw away OOP for a high level language is insight.
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  7. Jul 2nd, 2001, 02:09 PM #6
    Jotaf98
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    Oops sorry hehe

    It was 2am and I was kinda sleepy... sorry
    Code:
    Temp = Me.GetIQ()
'Error 9: Overflow
'DON'T PANIC! :eek:

    To learn how to use realistic effects in your games like fire, rain, snow and magic effects, read my article on particles systems here.


    Jotaf's Theories!
    "Cats land on their feet. Toast lands peanut butter side down. A cat with toast strapped to its back will hover above the ground in a state of quantum indecision."
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  8. Jul 2nd, 2001, 05:51 PM #7
    clsGenius
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    Probably the best thing to do...

    what you should do is use a mask and a subraction blt for the raster op constants, and that should work.
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  9. Jul 5th, 2001, 08:01 AM #8
    Jotaf98
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    Hey Genius, sorry but that's not possible, 1) there's no raster op like that, 2) even if there was it wouldn't work because you have no information on what's behind the pixels you subtracted
    Code:
    Temp = Me.GetIQ()
'Error 9: Overflow
'DON'T PANIC! :eek:

    To learn how to use realistic effects in your games like fire, rain, snow and magic effects, read my article on particles systems here.


    Jotaf's Theories!
    "Cats land on their feet. Toast lands peanut butter side down. A cat with toast strapped to its back will hover above the ground in a state of quantum indecision."
    Reply With Quote Reply With Quote
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